Rotary scraper



Patented Aug. 18, 1925..

a r E r s i c a GEORGE E. EGKAR/l, O'F MISHAWAKA, INDIANA, ASSIG1\TOR O15 ONE-HALF 'l0 JOHN ADDISON, OF CHICAGO, ILLIN'K'JIS.

ROTARY S CRAPER.

Application filed April as, 1924.

To all whom it may concern:

Be it known that I, Gnonen F. EGKAR'1, a citizen of the United States, residing at Mishawaka, in the county of St. Joseph and State of Indiana, have invented a new and useful Improvement in Rotary Scrapers, of which the following is a specification.

This invention relates to rotary scrapers and the like and is fully described in the following specification and shown in the accompanying drawings in which:

Figure 1 is a transverse section through a pair of rotary scrapers and the associated feed rolls;

Fig. 2 is a longitudinal section on the line 2 2 of Fig. 1;

Fig. 3 is a front elevation of a scraper element as it comes from the punching dies; and

Fig. 4; is a similar view of the same after having the tongues or prongs twisted at right angles to the original position.

This invention is an improvement on the construction shown and described in my Patent No. 1,471,782, dated October 23, 1923, and is particularly adapted to be used in the tobacco stemming machine shown in my pending application Serial No. 519,873.

The device as illustrated comprises a shaft upon which is mounted a number of scraper elements 11 which have inwardly extending keys 12 as shown in Fig. 1, which fit into a longitudinal keyway 13 in the shaft 10. The method of forming the elements will later be described. These ele ments are separated by annular scrapers 14:, the whole held rigidly upon the shaft 10 by means of collars 15 and nuts 16 which are screwed upon the threaded portions 17 of the shaft 10.

The scraper elements 11 are formed preferably from sheet steel blanks which are out by dies as shown in Fig. 3, and have a series of radiating tongues 18 having enlarged ends 19 at the outer ends having parallel sides 20 and terminating in points 21.

Annular members 22 which act as fillers are placed between the scraper elements 11 and around the spacers 1 1. These fillers serve to prevent tobacco leaves and the like from becoming wedged into the spaces between the tongues.

In this construction all the blades or tongues are arranged in rows running longitudinally of the shaft and the two shafts Serial N 0 8,4 8 9 10 and 10 are placed so that the tips of the blades 19 overlap as shown in Figs. and 2. By this arrangement spaces 23 (Fig. 2) are formed between rows of blades on the adjacent scrapers as they revolve, so as to receive leaves of tobacco to be stripped from the left of Fig. 1 and to pass these leaves to the right, preferably stem first to the shaker rolls A which are equipped to give a lateral shaking motion to the stems which pass through these rolls to the feed rolls B which are running at a much higher rate of speed than the shafts 10 and 10. These pulling rolls B then draw the tobacco stem through the rotary scraper blades 19, de positing the leaf in the spaces between successive rows of blades 19.

In order to prevent this tobacco leaf from becoming wedged between these blades, 1 have provided flat arcuate stripping lingers 23 and 24; which pass between the blades 19 as shown in Figs. 1 and 2. These are carried on suitable supports 25 and 26 which are supported from the main frame (not shown).

As the shafts 10 and 10 revolve in oppo site directions as indicated by the arrows, leaves are fed thereto, stems first, by a means, not shown. As has been previously explained the stems pass between the blades of the adjacent rotary scraper occupying the spaces 23*. As these stems are advanced by the movement of the rotary scrapers on the shafts 10 and 10, they pass between the shaking rolls A and are caught by the feed rolls B which pull the stems rapidly through the openings 23 thereby stripping the leaves from the tobacco stems. These leaves pile up between the adjacent rows of blades 19 and overlie the flat arcuate stripping fingers 23 and 24.

It will be observed that the members 23 and 24 terminate in outwardly curved ends 23 and 2 1, these ends extending beyond the tips of the blades 19 so that they serve to completely remove the tobacco leaves from between the successive rows of blades, thereby permitting them to fall between the shaft 10 and the shaking rolls A. Any tendency of strips of tobacco to adhere to the stems is further overcome by the violent shaking which these stems receive as they pass through the shaking rolls A.

The collars 15 are provided with annular grooves 15 and these match with complementary collars on the opposing shaft so as to hold the rotary scrapers in alignment and insure that the blades 19 on the two shafts maintain the proper positions as shown.

The scraping elements are stamped from sheet steel as shown in Fig. 3, after which each blade is twisted to the position shown in Fig. 4 after which it is tempered to give it the necessary hardness and elasticity.

IVhile I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

I claim:

1. In a rotary scraper, a shaft, a series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one element being separated from the blades of the adjacent elements, and stripping means passing between said blades as the scraper rotates.

2. In a rotary scraper, a shaft, :1. series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one element being separated from the blades of the adjacent elements, annular filler members between adjacent scraper elements, and stripping means passing between said blades as the scraper rotates.

3. In a rotary scraper, a shaft, a series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one element being separated from the blades of the adjacent elements, a bar parallel to the shaft, and stripping members carried thereby and passing between said blades as the scraper rotates.

4. In a rotary scraper, a shaft, a series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one elenent being separated from the blades of the adjacent elements, and fiat arcuate members extending into the space between said blades so as to assist in the removal of material between said blades.

5. In a rotary scraper, a shaft, a series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one element being separated from the blades of the adjacent elements, the blades of each scraper lying in substantially longitudinal rows, and stripping means passing between said blades as the scraper rotates.

6. In a rotary scraper, a shaft, a series of sheet metal scraper elements on the shaft, spacers between said elements, said elements having outwardly extending blades terminating in pointed tips, the blades of one element being separated from the blades of the adjacent elements, the sides of the outer portions of said blades being substantially parallel, and stripping means passing between said blades as the scraper rotates.

GEORGE F. ECKARI. 

